CN115823064A - Inner curve hydraulic motor performance test system under wide rotating speed range - Google Patents
Inner curve hydraulic motor performance test system under wide rotating speed range Download PDFInfo
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Abstract
The invention discloses a performance test system for an inner curve hydraulic motor in a wide rotating speed range, and belongs to the technical field of performance test of hydraulic motors. The test system comprises a tested motor, a loading motor, a flushing system, a throttling loading and power recovery loading system and a detection device. The test system can adopt throttling loading at a low rotating speed, improves the test precision of the lowest stable rotating speed, adopts power recovery loading at a high rotating speed, and reduces the installed power and the system heating. The two loading modes are quickly switched by a two-position three-way reversing valve. The test system has a wide test range, and can meet the performance test of the inner curve hydraulic motor with different displacement specifications and different rotating speed ranges.
Description
Technical Field
The invention belongs to the technical field of hydraulic motor performance testing, and particularly relates to performance testing of a low-speed large-torque hydraulic motor in a wide rotating speed range.
Background
The inner curve hydraulic motor is a radial plunger type low-speed large-torque hydraulic motor, has the advantages of low rotating speed, large torque, high efficiency, high power density and the like, and is widely applied to the rotary driving of various large-scale equipment. The performance of the system directly influences the working performance of the whole application system, and the comprehensive performance detection of the inner curve motor is required before installation of a host machine factory and in system fault diagnosis and maintenance.
The performance test method of the inner curve hydraulic motor can be divided into two types of throttling loading and power recovery loading according to different loading modes. The throttling loading mode is simple in structure, the load of the hydraulic motor can be changed directly through the opening degree of the regulating valve, but the temperature rise of the test system is high, and the economical efficiency is poor. The output torque per unit pressure of the inner curve hydraulic motor is large, and therefore the required loading power at high speed is also large, causing the loading element to fail.
The hydraulic power recovery loading mode can enable high-pressure oil output by the loading motor to flow into the tested motor again for loading, reduces energy dissipation of the system, does not need additional mechanical or electrical elements, and is good in economical efficiency. However, the test rotational speed is unstable at low speed. The minimum stable rotating speed of the inner curve motor is usually below 1r/min, and the accurate minimum stable rotating speed is difficult to measure in the hydraulic power recovery loading mode.
Therefore, the existing testing method cannot economically and effectively test various performances of the inner curve hydraulic motor in a wide rotating speed range.
Disclosure of Invention
The invention provides a method for testing the performance of an inner curve hydraulic motor in a wide rotating speed range based on throttling loading and hydraulic power recovery loading, aiming at the problems existing in the conventional method for testing the performance of the inner curve hydraulic motor. The two loading modes are integrated in a hydraulic system, the loading mode is quickly adjusted through adjustment of the reversing valve, a test bench is not required to be adjusted, and the low-speed stability test precision is improved while the cost required by the high-speed performance test of the inner curve hydraulic motor is reduced.
The purpose of the invention is realized by the following technical scheme: a performance test system for an inner curve hydraulic motor in a wide rotating speed range comprises a tested motor, a loading motor, a flushing system, a throttling loading and power recovery loading system and a detection device;
the detection device comprises a rotating speed and torque instrument, and the detected motor and the loading motor are respectively connected with the rotating speed and torque instrument through a coupler;
the rotation direction of the motor to be tested is adjusted through a three-position four-way reversing valve and a reversing valve group, and the pressure of the motor to be tested is adjusted through a pressure-controlled valve; one end of the pressure-receiving valve is connected with the outlet of the three-position four-way reversing valve, and the other end of the pressure-receiving valve is connected to the oil tank; an oil inlet and an oil outlet of the loading motor are connected to the reversing valve group;
the flushing system comprises a flushing pump, a flushing pump overflow valve and a throttle valve; the flushing pump is connected with the throttle valve in series, the throttle valve is respectively connected with the flushing oil ports of the tested motor and the loading motor through two quick-change connectors, one end of an overflow valve of the flushing pump is connected with one end of the flushing pump, and the other end of the overflow valve of the flushing pump and the other end of the flushing pump are both connected with an oil tank;
the throttling loading and power recovery loading system comprises an oil supplementing pump, an oil supplementing pump overflow valve, a loading overflow valve, a main pump overflow valve, a two-position three-way reversing valve and a main pump; one end of the oil supplementing pump overflow valve is connected with one end of the oil supplementing pump, and the other end of the oil supplementing pump overflow valve and the other end of the oil supplementing pump are both connected with the oil tank; one end of the main pump overflow valve is connected with one end of the main pump, the other end of the main pump overflow valve and the other end of the main pump are both connected with the oil tank, the oil supplementing pump and the loading overflow valve are both connected with a two-position three-way reversing valve, and the two-position three-way reversing valve and the main pump are connected with a reversing valve group; the throttling loading and power recovery loading system selects throttling loading or power recovery loading according to different rotating speeds of the loading motor, and the two loading modes are switched through the two-position three-way reversing valve.
Further, the measured motor and the loading motor can be at the same displacement or different displacements.
Furthermore, the detection device also comprises a flow measuring device, a pressure measuring device and a temperature measuring device which are respectively used for detecting the flow, the pressure and the temperature of the grid pipeline in the test system
Furthermore, the reversing valve group is a bridge type arrangement loop.
Furthermore, the oil replenishing pump is connected with a high-pressure constant delivery pump in parallel, one end of the high-pressure constant delivery pump is connected with a pipeline between the oil replenishing pump and the two-position three-way reversing valve, and the other end of the high-pressure constant delivery pump is connected to the oil tank.
Further, the tested motor and the loading motor are both provided with oil drainage oil paths which are connected to the oil tank through a first leakage port check valve and a second leakage port check valve respectively.
Further, the throttling load is used for testing the lowest stable rotating speed of the tested motor, and the power recovery load is used for testing the highest stable rotating speed of the tested motor.
The invention has the beneficial effects that:
the performance test system for the inner curve hydraulic motor in the wide rotating speed range provided by the invention has the advantages that the power of the motor is lower at low rotating speed, and various performances of the motor at low speed are tested by adopting a throttling loading mode. At the moment, the two-position three-way valve is positioned at the left position and is communicated with the outlet of the loading motor and the loading overflow valve, the system pressure is adjusted through the loading overflow valve, and the system flow is adjusted through adjusting the discharge capacity of the oil supplementing pump. At a high rotating speed, a hydraulic power recovery loading mode is adopted, the two-position three-way valve is located at the right position at the moment, the outlet of the loading motor and the inlet of the tested motor are communicated, the system pressure is adjusted through an oil supplementing pump and an overflow valve which are connected in parallel, and the system flow is adjusted through the discharge capacity of a main pump. The testing system has the advantages of flow stability under throttling loading, the lowest stable rotating speed and relevant performance parameters of the inner curve hydraulic motor, excellent energy-saving characteristic under power recovery loading, reduction of temperature rise caused by energy consumption in the system and improvement of testing precision. Therefore, the requirements of performance tests of pressure, flow, temperature, efficiency, rotating speed torque pulsation and the like under the wide rotating speed range of the hydraulic motors with different displacement inner curves can be met.
Drawings
FIG. 1 is a hydraulic schematic diagram of an inner curve hydraulic motor performance testing system under a wide rotating speed range.
In the figure, 1, a fuel tank; 2. a tank level gauge; 3. a tank thermometer; 4. an air filter; 5. a wind cooler; 6.1, a first low-pressure filter; 6.2, a second low-pressure filter; 7. a flush pump; 8. a flush pump motor; 9. an oil replenishing pump; 10. a motor of an oil replenishing pump; 11. a high-pressure constant delivery pump; 12. a high-pressure constant displacement pump motor; 13. a main pump; 14. a main pump motor; 15. a flush pump overflow valve; 16. a flush pump check valve; 17. an overflow valve of the oil replenishing pump; 18. a one-way valve of an oil replenishing pump; 19. a high pressure constant delivery pump check valve; 20. loading an overflow valve; 21. a main pump relief valve; 22. a pressure-controlled valve; 23.1, a first pressure gauge; 23.2, a second pressure gauge; 23.3, a third pressure gauge; 23.4, a fourth pressure gauge; 24. a throttle valve; 25. a three-position four-way reversing valve; 26. a two-position three-way reversing valve; 27.1, a first quick-change connector; 27.2, a second quick-change connector; 28.1, a first wide-range flow meter; 28.2, a second wide-range flow meter; 29.1, a first small-range flow meter; 29.2, a second small-range flow meter; 30. a first ball valve; 31. a second ball valve; 32. a leak wide range flow meter; 33. a small-range flow meter with a leakage port; 34. a third ball valve; 35.1, a first temperature sensor; 35.2, a second temperature sensor; 35.3, a third temperature sensor; 35.4, a fourth temperature sensor; 35.5, a fifth temperature sensor; 36.1, a first pressure sensor; 36.2, a second pressure sensor; 36.3, a third pressure sensor; 36.4, a fourth pressure sensor; 36.5, a fifth pressure sensor; 37. a rotational speed and torque meter; 38. a reversing valve group; 39.1, a first leakage port check valve; 39.2, a second leakage port check valve; 40. a motor to be tested; 41. the motor is loaded.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in FIG. 1, the invention provides a performance testing system for an inner curve hydraulic motor in a wide rotating speed range, which comprises a tested motor 40, a loading motor 41, a flushing system, a throttling loading and power recovery loading system and a detection device, wherein the loading motor is connected with the loading motor 41;
the tested motor 40 and the loading motor 41 are respectively connected with the rotating speed and torque instrument 37 through couplings;
the detection device comprises a rotating speed torquemeter 37, a flow measuring device, a pressure measuring device and a temperature measuring device which are respectively used for detecting rotating speed torquemeter, flow, pressure and temperature.
The flow measuring device comprises a first large-range flowmeter 28.1, a second large-range flowmeter 28.2, a first small-range flowmeter 29.1, a second small-range flowmeter 29.2, a leakage port large-range flowmeter 32 and a leakage port small-range flowmeter 33;
the pressure measuring device comprises a first pressure gauge 23.1, a second pressure gauge 23.2, a third pressure gauge 23.3, a fourth pressure gauge 23.4, a first pressure sensor 36.1, a second pressure sensor 36.2, a third pressure sensor 36.3, a fourth pressure sensor 36.4 and a fifth pressure sensor 36.5;
the temperature measuring device comprises an oil tank thermometer 3, a first temperature sensor 35.1, a second temperature sensor 35.2, a third temperature sensor 35.3, a fourth temperature sensor 35.4 and a fifth temperature sensor 35.5;
the measured motor 40 and the loading motor 41 can have the same displacement or different displacements; the rotation direction of the tested motor 40 is adjusted through a three-position four-way reversing valve 25 and a reversing valve group 38, the reversing valve group 38 is a bridge type arrangement loop, the pressure of the tested motor is adjusted through a pressure-controlled valve 22, one end of the pressure-controlled valve 22 is connected with an outlet of the three-position four-way reversing valve 25, a first pressure gauge 23.1 is installed on a connected pipeline, the three-position four-way reversing valve 25 is communicated to an oil outlet of the tested motor 40 through a second small-range flow meter 29.2 and a second large-range flow meter 28.2, the second small-range flow meter 29.2 is connected with a second ball valve 31 in parallel, a second temperature sensor 35.2 and a second pressure sensor 36.2 are installed on a pipeline between the second large-range flow meter 28.2 and the oil outlet of the tested motor 40, the other end of the pressure-controlled valve 22 is connected with a first low-pressure filter 6.1, the first low-pressure filter 6.1 is an oil return filter, and is connected to an oil tank 1 through an air cooler 5.
The flushing system comprises a flushing pump motor 8, a flushing pump 7, a flushing pump overflow valve 15, a flushing pump one-way valve 16, a throttle valve 24, a first quick-change connector 27.1 and a second quick-change connector 27.2;
the washing pump 7 is a vane pump, a washing pump motor 8 is mounted on the washing pump 7, the washing pump 7 is connected with a throttle valve 24 in series through a washing pump check valve 16, a second pressure gauge 23.2 is mounted on a pipeline between the washing pump check valve 16 and the throttle valve 24, an overflow valve 15 of the washing pump is connected with the washing pump 7 in parallel, a first quick-change connector 27.1 and a second quick-change connector 27.2 are arranged at the tail end of the throttle valve 24, the first quick-change connector 27.1 is connected with a washing oil port of a tested motor 40, and the second quick-change connector 27.2 is connected with a washing oil port of a loading motor 41.
The throttling loading and power recovery loading system comprises an oil supplementing pump motor 10, an oil supplementing pump 9, an oil supplementing pump one-way valve 18, an oil supplementing pump overflow valve 17, a loading overflow valve 20, a main pump overflow valve 21, a two-position three-way reversing valve 26, a main pump 13 and a main pump motor 14;
the oil supplementing pump 9 is a high-pressure variable displacement pump, an oil supplementing pump motor 10 is installed on the oil supplementing pump 9, one end of an overflow valve 17 of the oil supplementing pump is connected with the oil supplementing pump 9, the other end of the overflow valve is connected with the oil tank 1 through a first low-pressure filter 6.1, the oil supplementing pump 9 is connected with a high-pressure fixed displacement pump 11 in parallel, a high-pressure fixed displacement pump motor 12 is installed on the overflow valve, a high-pressure fixed displacement pump one-way valve 19 is installed on a pipeline of the high-pressure fixed displacement pump 11, one end of a two-position three-way reversing valve 26 is communicated with an oil outlet of a loading motor 41 through a reversing valve group 38, the other end of the two-position three-way reversing valve is communicated with an oil inlet of a measured motor 40 through a three-position four-way reversing valve 25, a first large-range flow meter 28.1 and a first small range flow meter 29.1, a first small range flow meter 29.1 is connected with an oil inlet of the measured motor 40 in parallel, and a third temperature sensor 35.3 and a third pressure sensor 36.3 are installed on a pipeline between the first small range flow meter 29.1 and the oil inlet of the measured motor 40; and a third pressure gauge 23.3 is arranged on a pipeline between the two-position three-way reversing valve 26 and the three-position four-way reversing valve 25, one end of the oil supplementing pump 9 is connected to the pipeline between the two-position three-way reversing valve 26 and the three-position four-way reversing valve 25 through an oil supplementing pump one-way valve 18, and the other end of the oil supplementing pump is connected to the oil tank 1 through a second low-pressure filter 6.2.
The main pump 13 is a variable pump, a main pump motor 14 is mounted on the main pump 13, one end of a main pump overflow valve 21 is connected with the main pump 13, and the other end of the main pump overflow valve is connected to the oil tank 1 through a first low-pressure filter 6.1 and the air cooler 5; one end of the main pump 13 is connected to the loading motor 41 through the reversing valve group 38, and the other end is connected to the oil tank 1 through the second low-pressure filter 6.2. And the oil inlet and outlet pipelines of the reversing valve group 38 and the loading motor 41 are respectively provided with a fourth temperature sensor 35.4, a fourth pressure sensor 36.4, a fifth temperature sensor 35.5 and a fifth pressure sensor 36.5. One end of the loading overflow valve 20 is connected with a two-position three-way reversing valve 26, a fourth pressure gauge 23.4 is arranged on a pipeline between the two-position three-way reversing valve and the loading overflow valve 20, and the other end of the loading overflow valve 20 is connected to the oil tank 1 through a first low-pressure filter 6.1.
An oil tank liquid level meter 2, an oil tank thermometer, an air filter 4, an air cooler 5, a first low-pressure filter 6.1 and a second low-pressure filter 6.2 are installed on the oil tank 1. The air cooler 5 is arranged between the oil tank 1 and the first low-pressure filter 6.1, and the first low-pressure filter 6.1 is connected with a pressure-controlled valve 22, a flushing pump overflow valve 15, an oil supplementing pump overflow valve 17, a loading overflow valve 20 and a main pump overflow valve 21; the second low-pressure filter 6.2 is connected with the flushing pump 7, the oil supplementing pump 9, the high-pressure fixed displacement pump 11 and the main pump 13;
the tested motor 40 and the loading motor 41 are both provided with oil drainage paths, and the tested motor 40 is connected to the oil tank 1 through the leakage port large-range flowmeter 32, the leakage port small-range flowmeter 33, the first leakage port check valve 39.1, the first low-pressure filter 6.1 and the air cooler 5; the leakage port small-range flow meter 33 is connected with a third ball valve 34 in parallel, and a first temperature sensor 35.1 and a first pressure sensor 36.1 are arranged on a pipeline between the tested motor 40 and the leakage port large-range flow meter 32; the charging motor 41 is connected to the oil tank 1 via a second leakage-port non-return valve 39.2, a first low-pressure filter 6.1 and the air cooler 5.
The performance test system for the inner curve hydraulic motor in the wide rotating speed range provided by the invention has the advantages that the power of the motor is lower in the low rotating speed, and various performances of the motor in the low speed are tested by adopting a throttling loading mode. At the moment, the two-position three-way valve is positioned at the left position and is communicated with the outlet of the loading motor and the loading overflow valve, the system pressure is adjusted through the loading overflow valve, and the system flow is adjusted through adjusting the discharge capacity of the oil supplementing pump. At a high rotating speed, a hydraulic power recovery loading mode is adopted, the two-position three-way valve is located at the right position and is used for communicating the outlet of the loading motor with the inlet of the motor to be tested, the system pressure is regulated through the oil supplementing pump and the overflow valve connected in parallel, and the system flow is regulated through the discharge capacity of the main pump. The testing system has the advantages of flow stability under throttling loading, lowest stable rotating speed and relevant performance parameters of the hydraulic motor with the inner curve, excellent energy-saving characteristic under power recovery loading, reduction of temperature rise caused by energy consumption in the system and improvement of testing precision. Therefore, the requirements of performance tests of pressure, flow, temperature, efficiency, rotating speed torque pulsation and the like under the wide rotating speed range of the hydraulic motors with different displacement inner curves can be met.
At low rotation speed, the flow is small, the ball valve connected with the small-range flowmeter in parallel is closed, and the flow value is read from the small-range flowmeter at the moment; at high rotation speed, the flow is large, the ball valve connected with the small-range flowmeter in parallel is opened to bypass the small-range flowmeter, and the flow value is read from the large-range flowmeter.
The test system provided by the invention comprises the following four functions which are introduced respectively as follows:
(1) Throttle loading function
And under the condition of lower test rotating speed, the flow is smaller, and in order to ensure that the tested motor 40 obtains stable input flow and test the lowest stable rotating speed, a throttling loading mode is adopted. At this time, the two-position three-way selector valve 26 is switched to the right position, and the outlet of the charge motor 41 is communicated with the charge relief valve 20. The system loading pressure is adjusted by adjusting the pressure of the relief valve. At this time, the oil supplementing pump 9 supplies oil to the tested motor, and the overflow valve 17 of the oil supplementing pump functions as a safety valve. Because the flow is small, the pressure grade is high, and the oil supplementing pump can be driven by a motor with smaller power. The main pump 13 has a supercharging function, is low in pressure level and can be driven by a motor with lower power. The reversing valve group 38 ensures that the loading motor 41 inputs low-pressure oil and outputs high-pressure oil to work under the pump working condition.
In order to ensure the stability of the input flow of the tested motor 40, an accumulator can be connected in parallel at the outlet of the oil supplementing pump, so that the flow pulsation is reduced.
(2) Power scavenging load function
Under the condition that the test rotating speed is high, the flow is high, at the moment, if throttling loading is adopted, the loading power in the system is dissipated in the form of heat, the temperature rise of a loading overflow valve is high, and damage to elements and the system can be caused. Therefore, the highest stable rotating speed of the tested motor 40 is tested by adopting a loading mode of hydraulic power recovery. At this time, the two-position three-way directional valve 26 is switched to the left position to connect the outlet of the loading motor 41 and the inlet of the motor 40 to be tested. At this time, the high-pressure oil output from the loading motor 41 reenters the motor 40 to be tested, and drives the motor to be tested to operate. At this time, the oil replenishing pump relief valve 17 regulates the system pressure, and the oil replenishing pump 9 plays an oil replenishing role. The main pump 13 provides the main flow required for motor operation, and regulates the system flow by regulating the main pump displacement, thereby regulating the motor test speed. The main pump relief valve 21 compensates for pressure losses in the system by regulating the main pump outlet pressure. In the example, the output flow of the main pump is large, but the pressure grade is low, the pressure grade of the oil supplementing pump is high, and the output flow is small, so that the power required by the driving motors of the two pumps is relatively small, the installed power can be reduced, and the effects of energy conservation and emission reduction are achieved.
(3) Flushing function
This function is in order to cool off the inner curve motor casing, takes away the impurity that produces in the motor work. The flushing pump 7 is a vane pump and provides flushing flow, the overflow valve 15 of the flushing pump adjusts the pressure of a flushing oil path, and the throttle valve 24 adjusts the flushing flow. The flushing oil circuit is simultaneously connected with the motor to be tested and the torque motor, and can also provide pressure oil required by brake opening for an inner curve hydraulic motor with a built-in brake function. The flushed oil flows from the motor leakage port to the first low pressure filter 6.1 and the air cooler 5, where it is filtered and cooled. The first leakage port check valve 39.1 and the second leakage port check valve 39.2 on the oil drainage path have the function of preventing leakage oil from flowing backwards.
(4) Performance parameter detection function
Output signals of a flow sensor, a pressure sensor, a temperature sensor and a rotating speed and torque instrument in the system are collected through an NI signal collecting module, signal processing is carried out through a PLC, and then the signals are sent to an upper computer, and the upper computer carries out performance parameter display through a man-machine interaction interface.
In this example, because the inlet and outlet flows and the leakage flow of the motor to be tested are different under the low-speed and high-speed working conditions, two flow sensors with different ranges are arranged on the inlet and outlet oil paths and the leakage oil path. The small-scale and medium-scale range sensors are connected with the ball valve in parallel, the ball valve is closed under the low-speed working condition, hydraulic oil flows through the sensors with two ranges, and only the flow is read from the small-scale range flow sensor; under the high-speed working condition, the ball valve is opened, hydraulic oil only flows through the wide-range flow sensor, the small-range flow sensor is bypassed, and flow data are read from the small-range flow sensor.
In summary, the embodiment of the invention provides a performance test system for an inner curve hydraulic motor under a wide rotating speed range based on throttling loading and hydraulic power recovery loading.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The performance test system for the inner curve hydraulic motor in the wide rotating speed range is characterized by comprising a tested motor (40), a loading motor (41), a flushing system, a throttling loading and power recovery loading system and a detection device;
the detection device comprises a rotating speed and torque meter (37), and the detected motor (40) and the loading motor (41) are respectively connected with the rotating speed and torque meter (37) through couplers;
the rotation direction of the tested motor (40) is adjusted through a three-position four-way reversing valve (25) and a reversing valve group (38), and the pressure of the tested motor is adjusted through a pressure-controlled valve (22); one end of the pressure-receiving valve (22) is connected with the outlet of the three-position four-way reversing valve (25), and the other end is connected to the oil tank (1); the oil inlet and the oil outlet of the loading motor (41) are connected to a reversing valve group (38);
the flushing system comprises a flushing pump (7), a flushing pump overflow valve (15) and a throttle valve (24); the flushing pump (7) and the throttle valve (24) are connected in series, the throttle valve (24) is respectively connected with the flushing oil ports of the tested motor (40) and the loading motor (41) through two quick-change connectors, one end of the flushing pump overflow valve (15) is connected with one end of the flushing pump (7), and the other end of the flushing pump overflow valve (15) and the other end of the flushing pump (7) are both connected with the oil tank (1);
the throttling loading and power recovery loading system comprises an oil supplementing pump (9), an oil supplementing pump overflow valve (17), a loading overflow valve (20), a main pump overflow valve (21), a two-position three-way reversing valve (26) and a main pump (13); one end of the oil supplementing pump overflow valve (17) is connected with one end of the oil supplementing pump (9), and the other end of the oil supplementing pump overflow valve (17) and the other end of the oil supplementing pump (9) are both connected with the oil tank (1); one end of the main pump overflow valve (21) is connected with one end of the main pump (13), the other end of the main pump overflow valve (21) and the other end of the main pump (13) are both connected with the oil tank (1), the oil supplementing pump (9) and the loading overflow valve (20) are both connected with a two-position three-way reversing valve (26), and the two-position three-way reversing valve (26) and the main pump (13) are connected with a reversing valve group (38); the throttling loading and power recovery loading system selects throttling loading or power recovery loading according to different rotating speeds of a loading motor (41), and two loading modes are switched through a two-position three-way reversing valve (26).
2. The system of claim 1, wherein the tested motor and the loading motor may be of the same displacement or different displacements.
3. The system according to claim 1, wherein the testing device further comprises a flow measuring device, a pressure measuring device, and a temperature measuring device for measuring the flow, pressure, and temperature of the grid line of the testing system.
4. The system for testing the performance of an inner curve hydraulic motor in a wide range of speeds as set forth in claim 1, wherein said reversing valve set (38) is a bridge type trim circuit.
5. The system for testing the performance of the inner curve hydraulic motor in the wide rotating speed range is characterized in that the oil supplementing pump (9) is connected with a high-pressure constant delivery pump (11) in parallel, one end of the high-pressure constant delivery pump (11) is connected with a pipeline between the oil supplementing pump (9) and the two-position three-way reversing valve (26), and the other end of the high-pressure constant delivery pump is connected to the oil tank (1).
6. The system for testing the performance of the inner curve hydraulic motor in the wide rotating speed range is characterized in that the tested motor (40) and the loading motor (41) are respectively provided with a drain oil path and are respectively connected to the oil tank 1 through a first leakage port check valve (39.1) and a second leakage port check valve (39.2).
7. The system according to claim 1, wherein the throttling load is used for testing the lowest stable speed of the tested motor (40), and the power recovery load is used for testing the highest stable speed of the tested motor (40).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117628004A (en) * | 2023-11-09 | 2024-03-01 | 浙江大学 | Low-speed stability testing system for inner curve hydraulic motor |
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